Abstract: A method for xerographic printing, comprises the steps of, holding a part of a work sheet at a position other than a leading end of the work sheet, before the leading end contacts with a toner image forming surface on which a toner image is formed by an electrostatic, charge of toner, holding both surfaces of the leading end of the work sheet and applying a frictional force to at least one of the surfaces of the leading end so that a tension is applied to the work sheet between the held part and the leading end, before the leading end contacts with the toner image forming surface, and making the work sheet contact with the toner image forming surface, and transferring the toner image from the toner image forming surface to the surface of the work sheet by generating an electric field for attracting the charged toner to the surface of the work sheet.

Abstract: A xerographic printing method comprises the steps of: estimating, before an attitude of the work sheet is corrected, a position of work sheet which will be obtained in a direction substantially perpendicular to a work sheet feed direction after the attitude of the work sheet is corrected, determining, in accordance with the estimated position of work sheet, a position of a toner image to be formed on a toner image forming surface in the direction substantially perpendicular to the work sheet feed direction, correcting the attitude of the work sheet and forming the toner image on the determined position on the toner image forming surface, and transferring the toner image on the toner image forming surface to a surface of the work sheet.

Abstract: A sheet reversing apparatus comprises a support in which sheets are stacked, an entrance section for guiding the sheet to the support, a blowing mechanism for directing an air stream to a sheet stack on the support to separate a lowermost sheet from remaining sheets, and a feeding mechanism for attracting the sheet to feed it. Further, stopper plates are provided to be pivoted above the support so that it cooperates with the support to pinch and brake the sheet therebetween in a continuous reversing mode wherein the incoming sheet is immediately fed and that it abuts against the incoming sheet by a portion thereof opposing a leading end of the sheet in a stack reversing mode wherein while the sheets are being stacked the lowermost sheet is separated and fed.

Abstract: A copy sheet, to which a developed image has been transferred by a transfer device, continues to be attracted to a copy sheet carrying surface of an insulating film and delivered toward a fusing roller pair. A force in a direction for pressing the copy sheet toward the insulating film is exerted, by an attraction strengthening device, on the copy sheet which is passing the vicinity of a downstream end of the copy sheet carrying surface after the transfer operation. This force strengthens a force for retaining the copy sheet on the copy sheet carrying surface of the insulating film, so as to hinder a portion of the copy sheet from being bent upwardly to the side of a photoreceptor and separated from the insulating film. Thus, separation of the copy sheet from the insulating film can be prevented from extending as far as a transfer position.

Abstract: A sheet separating and feeding apparatus has a separating device and a vacuum-attracting device to separate and feed sheets one by one from piled sheets. The separating device includes a compressed air plenum chamber, and main nozzles, first auxiliary nozzles and second auxiliary nozzles which are provided on the compressed air plenum chamber for causing air to blow to an upper portion of the piled sheets to separate the uppermost sheet from the remaining sheets. The vacuum-attracting device includes a vacuum chamber and an endless belt having a plurality of through holes provided in a part of the belt. The endless belt rotates around the vacuum chamber, and attracts the uppermost sheet which is separated by the separating device, when the through holes intermittently communicate with a negative pressure in the vacuum chamber.

Abstract: To adjust the posture of a sheet being conveyed, movable checker members provided adjacent to the conveyance path for the sheet are once driven in the direction of conveyance of the sheet before the members touch the sheet and are subsequently decelerated, the members being caused to abut against the front end of the sheet during the deceleration, thereby checking the sheet and thus correcting any skew thereof. Further, for positioning the sides of the sheet, the sheet is taken out of a hopper by way of a separating device and is guided and fed in such a manner that its front corner will not be caused to abut against a side registration guide, and subsequently the sheet is conveyed toward the guide by way of obliquely extending conveyer belt devices and one side of the sheet is brought into contact with the guide for positioning after a front corner of the sheet has passed at least the edge of the guide.

Abstract: A method of controlling print positioning comprises the steps of: detecting the time which elapses until a sheet of paper reaches a given position; predicting the time which would elapse until the paper reaches an image transfer position on the basis of the time detected in the detection step; calculating the time difference between the predicted time and an elapse time calculated on the basis of a paper carrying speed pattern which is previously stored and has at least two speeds; and controlling the paper carrying speed so that the calculated time difference becomes zero, thereby preventing any misregistration between a toner image and the paper.

Abstract: A line by image signal in a facsimile transmission is transmitted at a random time interval. A minimum time interval (highest record speed) is determined by a transmission ability of a transmission line. A paper feed drive motor requires a considerable time to accelerate from a stop state to the highest record speed. The image signal transmitted during the acceleration time is stored in a memory to prevent an error in the recording and the paper feed drive motor is controlled by a speed pattern determined by the number of lines stored in the memory. Thus, a response ability of the drive motor is compensated and a high response is attained. The memory needs only a capacity sufficient to store the data before the highest record speed is reached.

Abstract: An electrostatic printing apparatus of the pressure fixing type having a toner image formed on a recording sheet fixed by applying pressure, including a tension imparting device for imparting to the recording sheet a tension oriented in the direction of travel of the recording sheet and a tension oriented in a direction perpendicular to the direction of its travel, and a regulating device for regulating the angle and posture of the recording sheet located in the path of movement of the recording sheet immediately before a pressure fixing roller device. The recording sheet is kept in taut condition as it is fed to the pressure fixing roller device to enable wrinkling, jamming and skewing of the recording sheet to be avoided.